There are a number of changes coming to the Drusella's Vault raid for the May update. Drusella's wander has been removed entirely, as it was effectively random in how it lined up with her chase mechanic, depending on when the raid was triggered. Please see the May Test update notes for details. The changes to the event described in the April update notes were the only changes made to the event for the April update. I've received feedback that the event is much harder, much easier, and exactly the same since the April update. Randomness in the event can lead to a different experience, and while we do like randomness, I feel there was too much of it for the Drusella's Vault raid. Where in the room the waves of weapon NPCs spawned could drastically affect the difficulty of the event, as one or two skulls spawning near and attacking a tank or melee character was effectively a deathtouch. Which 3 of the 4 final sarnaks attack in the final phase of the event is random, and reportedly one of them is much more of a challenge to deal with than the other 3. And, as mentioned above, how and when Drusella wandered could annihiliataee the raid. The upcoming changes are meant to reduce the randomness of these mechanics.